Among the new features are improved performance in most areas of the app and a revamped header that makes it much easier to reply to and forward messages. This latter improvement addresses my biggest pet peeve about using Gmail on the EVO; the most commonly used action buttons (reply, reply all, forward) are finally not pinned to the bottom of the message anymore. They're all accessible through a new arrow icon at the top.
This subtle change makes such a tremendous difference in usability and intuitiveness, as it was always such a pain to scroll to the bottom of those crazy-long emails just to send a quick "Yes" response. The redesigned header alone is worth the upgrade to me.
